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[Cr2(ox)5]4-.
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Potassium ferrioxalate (K3[Fe(C2O4)3]·3H2O)
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Oxaliplatin, an anticancer drug
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[Zr(ox)4]4-
Transition metal oxalate complexes are coordination complexes with oxalate (C2O42−) ligands. Some are useful commercially, but the topic has attracted regular scholarly scrutiny. Oxalate (C2O42-) is a kind of dicarboxylate ligand.[1] As a small, symmetrical dinegative ion, oxalate commonly forms five-membered MO2C2 chelate rings. Mixed ligand complexes are known, e.g., [Co(C2O4)(NH3)4]κ+.[2]